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72km/jam =20m/s
Ek=1/2 mv^
Ek=1/2 5.10^-3.400
Ek=1J
v=72 km/jam=20 m/s
Ek=
Ek=1/2.m.v^2
Ek=1/2.5000.20^2
Ek=200.5000
Ek=1000000 J